0
Files
src/base/sequence_checker_impl.h
David Bienvenu 5f4d4f031c Remove DISALLOW_COPY_AND_ASSIGN from base/*
Also fix cpp lint warnings. No functional changes.

Bug: 1010217
Change-Id: I60c13a4f4667522c7661b3ab91b948e71a06e657
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2432204
Commit-Queue: David Bienvenu <davidbienvenu@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811059}
2020-09-27 16:55:03 +00:00

62 lines
2.2 KiB
C++

// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_SEQUENCE_CHECKER_IMPL_H_
#define BASE_SEQUENCE_CHECKER_IMPL_H_
#include <memory>
#include "base/base_export.h"
#include "base/synchronization/lock.h"
#include "base/thread_annotations.h"
namespace base {
// Real implementation of SequenceChecker for use in debug mode or for temporary
// use in release mode (e.g. to CHECK on a threading issue seen only in the
// wild).
//
// Note: You should almost always use the SequenceChecker class to get the right
// version for your build configuration.
// Note: This is only a check, not a "lock". It is marked "LOCKABLE" only in
// order to support thread_annotations.h.
class LOCKABLE BASE_EXPORT SequenceCheckerImpl {
public:
SequenceCheckerImpl();
// Allow move construct/assign. This must be called on |other|'s associated
// sequence and assignment can only be made into a SequenceCheckerImpl which
// is detached or already associated with the current sequence. This isn't
// thread-safe (|this| and |other| shouldn't be in use while this move is
// performed). If the assignment was legal, the resulting SequenceCheckerImpl
// will be bound to the current sequence and |other| will be detached.
SequenceCheckerImpl(SequenceCheckerImpl&& other);
SequenceCheckerImpl& operator=(SequenceCheckerImpl&& other);
SequenceCheckerImpl(const SequenceCheckerImpl&) = delete;
SequenceCheckerImpl& operator=(const SequenceCheckerImpl&) = delete;
~SequenceCheckerImpl();
// Returns true if called in sequence with previous calls to this method and
// the constructor.
bool CalledOnValidSequence() const WARN_UNUSED_RESULT;
// Unbinds the checker from the currently associated sequence. The checker
// will be re-bound on the next call to CalledOnValidSequence().
void DetachFromSequence();
private:
class Core;
// Calls straight to ThreadLocalStorage::HasBeenDestroyed(). Exposed purely
// for 'friend' to work.
static bool HasThreadLocalStorageBeenDestroyed();
mutable Lock lock_;
mutable std::unique_ptr<Core> core_ GUARDED_BY(lock_);
};
} // namespace base
#endif // BASE_SEQUENCE_CHECKER_IMPL_H_